Red Hat ENTERPRISE LINUX 5.5 - TECHNICAL NOTES Manual page 115

RHSA-2010:0178: Important Red Hat Enterprise Linux 5.5 kernel security and bug fix update
A problem was found where, under the right conditions, it was possible for packets to become re-
ordered prior to the assignment of a Transmission Sequence Number (TSN) value. The conditions
which caused this are the fact that multiple interfaces were used in transmission, where each had
differing Path Maximum Transmission Unit (pmtu) values.
This update addresses the problem with the SCTP stack that allowed this reordering to occur.
• Cap kernel at 1024G on x86_64 systems.
• Fix kernel crash when 1TB of memory and NUMA is used.
• kvm: Allow kvmclock to be overwritten.
• glibc should call pselect() and ppoll() on Itanium kernels.
• Force Altix drivers to use 64-bit addressing. This update is Altix-specific.
This update applies to the 64-bit Itanium2 architecture.
• vsmp: Fix bit-wise operator and compile issue.
• Fix hugepage memory tracking.
1.88.7.1.2.4. IBM S/390-specific Updates
• qeth: Set default BLKT settings by OSA hw level.
A problem was found where new hardware was being configured with values for old hw levels,
because BLKT settings were not being set according to different hw levels.
This update ensures that the BLKT settings are applied after the hw level has been probed.
• Clear high-order bits after switching to 64-bit mode.
• Fix single stepping on svc 0.
A problem was found where if a system call number > 256 is single-stepped or svc 0 is single-
stepped then the system call would not be executed. This update provides a solution to this
problem.
• DASD: Support DIAG access for read-only devices.
• IUCV: Use correct output register in iucv_query_maxconn().
A problem was found where the system log contained kernel messages reporting that the IUCV
"pathid" was greater than max_connections. This is because the wrong output register was used
when querying the maximum number of IUCV connections.
This update ensures that the correct output register is used, and this problem no longer occurs.
• cio: Fix set online/offline processing failures.
A problem was found where the set online or set offline routines failed for a DASD device.
Afterwards this device could neither be set online nor offline.
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